Introducer sheath with embolic protection

ABSTRACT

The embolic protection device comprises an embolic filter attached to an inner sheath. The embolic filter includes at least a first catheter access port and a second catheter port. At least the first catheter port will typically be radially expandable to receive catheters of different diameters and will be located at an atypical end of an aero conical structure at a downstream end of the filter.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No.14/537,814 (Attorney Docket No. 41959-707.201), filed Nov. 10, 2014, nowU.S. patent Ser. No. ______, which claims the benefit of U.S.Provisional Application No. 62/050,156 (Attorney Docket No.41959-707.101), filed Sep. 14, 2014, the full disclosure of which isincorporated herein by reference.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates generally to medical devices and methodsand more particularly to apparatus and methods for providing embolicprotection to a patient's aortic arch vessels during cardiac surgery andinterventional cardiology procedures.

Cerebral embolism is a known complication of cardiac surgery,cardiopulmonary bypass and catheter-based interventional cardiology andelectrophysiology procedures. Embolic particles, which may includethrombus, atheroma, and lipids, may become dislodged by surgical orcatheter manipulations and enter the bloodstream, embolizing in thebrain or other vital organs downstream. Cerebral embolism can lead toneuropsychological deficits, stroke and even death.

Prevention of embolism would benefit patients and improve the outcome ofmany surgical procedures. Many current devices for preventing cerebralembolism may be less than ideal in various respects. For example, suchcurrent devices may involve multiple components and multiple steps,making the use of such devices cumbersome and even injury-prone for thepatient. Also, when used with other catheter-based interventional tools,the patient's vasculature may need to be accessed at multiple points andthrough multiple paths. For example, a current embolic protection devicemay be advanced into the aortic arch through the descending aorta whileother catheter-based interventional tools may then need to be advancedinto or into proximity with the heart through other blood vesselsincluding the vena cava, the right common carotid artery, and the leftcommon carotid artery.

U.S. Patent Publ. 2013/0178891, commonly assigned herewith, describes anembolic protection device having embolic protection elements that arecombined with an access sheath suitable advancing a diagnostic catheter.The embolic protection elements include an embolic filter slidablymounted on a distal portion of the sheath, a proximal stop for limitingthe proximal movement of the embolic filter, and a distal stop forlimiting the distal movement of the embolic filter. The filter comprisesa porous mesh material defining a collection chamber for captured emboliand has a collapsed and a deployed configuration. The filter may becollapsed by an access sheath used with the catheter. An access sheathmay comprise a tubular main body and an embolic filter mounted on thedistal portion of the tubular main body. The embolic filter may revertinto the central lumen of the sheath or may be constrained on theexterior of the sheath with a larger diameter outer tube.

While very effective for protecting the aortic branch vessels fromemboli, the illustrated access sheath allows only a single catheter at atime to pass through the filter. Moreover, the sheath dimensions canlimit the size of catheter which can be introduced which is a particularconcern if a valvuloplasty catheter or prosthetic aortic or other valveis to be delivered over the aortic arch to the heart. Therefore,improved devices, systems, and methods for preventing embolism duringcardiac procedures performed over the aortic arch that overcome at leastsome of the aforementioned short-comings are desired.

2. Description of the Background Art

U.S. Patent Publ. 2013/0178891 has been described above. Other devicesfor capturing or blocking emboli to prevent cerebral embolism aredescribed in the following patent application and patent publications:U.S. Pub. No. 2010/0312268 to Belson, entitled “Embolic ProtectionDevice”; U.S. Pub. No. 2004/0215167 to Belson, entitled “EmbolicProtection Device”; U.S. Pub. No. 2003/0100940 to Yodfat, entitled“Implantable Intraluminal Protector Device and Method of Using Same forStabilizing Atheromoas”; PCT Pub. No. WO/2004/019817 to Belson, entitled“Embolic Protection Device”; U.S. Pat. No. 6,537,297 to Tsugita et al.,entitled “Methods of Protecting a Patient from Embolization DuringSurgery”; U.S. Pat. No. 6,499,487 to McKenzie et al., entitled“Implantable Cerebral Protection Device and Method of Use”; U.S. Pat.No. 6,371,935 to Macoviak et al., entitled “Aortic Catheter with FlowDivider and Methods for Preventing Cerebral Embolization”; U.S. Pat. No.6,361,545 to Macoviak et al., entitled “Perfusion Filter Catheter”; U.S.Pat. No. 6,254,563 to Macoviak et al., entitled “Perfusion ShuntApparatus and Method”; U.S. Pat. No. 6,139,517 to Macoviak et al.,entitled “Perfusion Shunt Apparatus and Method”; and U.S. Pat. No.5,769,819 to Barbut et al., entitled “Cannula with Associated Filter.”

BRIEF SUMMARY OF THE INVENTION

The present invention provides methods, systems, and devices forcollecting emboli and in particular for preventing the release of emboliinto the cerebral vasculature during the performance of interventionalprocedures in a patient's aorta, including aortic valve replacement,aortic valve valvuloplasty, and the like, where there is a risk ofemboli being released into the aortic side vessels, including thebrachiocephalic artery, the left carotid artery, and the left subclavianartery. The present invention provides an embolic protection device andsystem which can be placed through the descending aorta and over theaortic arch to inhibit emboli release into the aortic side branchvessels while allowing simultaneous access to the aortic valve by atleast two interventional and/or diagnostic catheters being introducedfrom the descending aorta, typically by conventional femoral arteryaccess.

The embolic protection device will include both an embolic filter and aninner sheath connected to the embolic filter. The inner sheath isattached to or on a downstream portion of the embolic filter, wheredownstream refers to the direction towards the descending aorta and awayfrom the heart and aortic arch. The inner sheath has a lumen and willprovide a first access route to an interior of the embolic filter forintroducing one diagnostic or interventional catheter at a time. Atleast one additional port will be formed in the embolic filter forintroducing at least one additional catheter so that the additional orsecond catheter can be present within the interior of the embolic filtersimultaneously with the initial or first catheter introduced through thesheath. The additional port will typically have an expandable diameterso it will remain generally closed when no catheter is present but willbe able to open and to conform to catheters of different diameters asthey are introduced therethrough into the interior of the embolic filterand typically onward to the aortic valve for performing an aorticintervention.

In a first specific aspect of the present invention an embolicprotection device comprises an inner sheath having a lumen with a distalopening and an embolic filter. The embolic filter comprises a porousmesh material having a cylindrical outer wall which defines an interiorwhich includes a collections chamber for capturing emboli. The filterhas an open upstream end and a closed downstream end, where blood andemboli my enter through the open upstream end and deposit within thecollection chamber which is at least partially defined by the closeddownstream end. The filter will further have both a radially collapseddelivery configuration and a radially expanded configuration, and theouter wall will typically be configured to contact a blood vessel wallto direct blood flow through the upstream end and emboli into thecollection chamber. The embolic filter will have at least a first portcomprising an expandable opening configured to conform to an outer wallof a first catheter passing there through and a second port which isattached to the inner sheath to allow a second catheter to be advancedthrough the lumen of the inner sheath so that it can enter the interiorof the embolic filter.

In specific embodiments of the embolic protection device of the presentinvention, at least one of the first port and the second port is formedin the closed downstream end of the embolic filter. Often, both thefirst and second ports will be formed in the closed downstream end, butin other embodiments at least one of the ports may be formed through thecylindrical outer wall of the porous mesh material, for example wherethe inner sheath may pass through a port or opening though thecylindrical outer wall at a location in an upstream direction from theclosed downstream end of the filter.

In still other embodiments of the embolic protection device, the embolicfilter further includes at least a first conical inner portion whichdefines the collection chamber between an inner surface of the outercylindrical wall and an outer surface of the conical inner portion. Insuch embodiments, an apical end of the conical inner portion will beoriented towards the open upstream end of the embolic filter. Typically,the first port having an expandable opening will be formed at or in theapical end of the conical portion, in such embodiments, the conicalportion will have a wide opening at its downstream end to facilitateentry of a diagnostic or interventional catheter through the expandableport. The expandable port may comprise a simple slit or duck-bill-likeopening, or optionally may further comprise a resilient seal positionedwithin or over the port for conforming to a catheter as it passesthrough the port.

In still further embodiments, the embolic protection device may includea second conical inner portion which, together with the first conicalinner portion, will define the collection chamber between the innersurface of the cylindrical outer wall and the outer surfaces of both thefirst and second conical inner portions. In such instances, the apicalend of the second conical inner portion will be oriented towards theupstream end of the embolic filter, and typically the inner sheath isattached to the apical end of the second conical inner portion, moretypically being attached so that an upstream end of the inner sheathwill be positioned beyond the apical end of the second conical structurein the upstream direction.

In still other embodiments, a distal portion of the inner sheath maypass through the second port of the embolic filter and extend in anupstream direction some distance within the interior of cylindricalwall. In some cases, the inner sheath may be attached to the cylindricalwall or, in other cases, to a side wall of the first conical innerportion. In still other embodiments, the inner sheath may pass through awall of the first conical inner portion so that the sheath enters theembolic filter through the open downstream end of the conical innerportion and then passes into the interior of the filter portion throughthe wall of the conical inner portion. A variety of other ways forattaching the inner sheath to the embolic filter described in moredetail below.

The porous mesh material will typically be formed from an elastic orsuper elastic metal, such as nickel-titanium alloy, which can bepreformed into its radially expanded configuration and then constrainedinto its radially collapsed delivery configuration, either by anexternal outer delivery sheath or by an internal stylet used to elongatethe embolic filter. Other available materials for the porous meshincluded knitted fabrics, woven fabrics, woven fibers, non-woven fibers,filaments, and wires having a pore size chosen to prevent emboli largerthan a predetermined size from passing through the mesh. Other materialsinclude other metals, polymer materials, plastically deformablematerials, and the like. In the case of malleable and plasticallydeformable materials, further structure may be provided to radiallyexpand and radially collapse the embolic filter before delivery anddeployment. Typical pore sizes for the mesh materials are in the rangefrom about 0.1 mm to about 1 mm, and the porous mesh material willtypically be coated with an anti-thrombogenic coating. Radiopaquemarkers will be typically provided on the embolic filter and/or theinner sheath.

In a second aspect of the present invention, a method for advancing acatheter over an aortic arch having aortic side vessels comprisesproviding an embolic protection device including a cylindrical outersleeve formed at least partly from a porous mesh and having an interiorwhich defines a collection chamber for captured emboli. The embolicprotection filter will have an open upstream end, a closed downstreamend, a radially collapsed delivery configuration, and a radiallyexpanded configuration for deployment within the aortic arch. Thecylindrical outer sleeve is radially expanded so that the porous meshcovers the aortic side vessels and the upstream faces the heart todirect blood flow through the upstream end of the filter and emboli intothe collection chamber. As a result, blood flowing into the aortic sidevessels will pass through the porous mesh which will separate theemboli. After the filter is in position, a first catheter may beadvanced from an arterial lumen downstream of the closed downstream endof the embolic protection filter through a first port therein. A secondcatheter may be advanced from the same or a different arterial lumendownstream of the closed downstream end of the embolic protection filterthrough a second port. In this way, at least two catheters may besimultaneously introduced into the interior of the filter and optionallybeyond to the aortic valve in order to perform the desired aortic valveinterventions. For example, a small catheter for delivering contrastmedia may be introduced through one of the ports while a secondinterventional catheter may be delivered through the other port. Thecontrast delivery catheter may be positioned within the filter torelease contrast media, while the interventional catheter may beadvanced out through the open upstream end of the filter in order toperform the desired intervention on the aortic valve.

In a first specific embodiment of the methods of the present invention,the embolic protection filter may further include a first conical innerstructure formed through the cylindrical outer sleeve and having anapical end directed into the blood flow from the heart. The first portmay be disposed at or near the apical end of the first conical innerstructure where the availability of the enlarged downstream end of theconical port is particularly advantageous for receiving larger,interventional catheters therethrough.

In still other embodiments, a second inner sheath may be attached to thesecond port so that the second catheter may be advanced through a lumenof the inner sheath before passing through the second port. Theinclusion of the inner sheath provides a number of advantages. As afirst advantage, the inner sheath may be used to advance and positionthe embolic protection filter within the aortic arch. For example, theinner sheath may be used to advance the embolic protection filterthrough an outer delivery sheath that constrains the embolic protectionfilter and its radially collapsed configuration while it is beingdelivered. The embolic protection filter will typically beself-expanding, as described above, allowing it to radially expand andassume its deployed configuration as it is advanced beyond a distal endof the delivery sheath. Alternatively, a stylet may be positioned withinthe inner sheath and extend through the embolic protection filter toselectively elongate and radially collapse the embolic protection filterwhile it is being delivered. When using the stylet, the embolicprotection filter may be radially expanded by proximally retracting thestylet relative to the filter to release the filter from radialconstraint.

The embolic protection device will usually be self-supporting in thedeployed condition. In other embodiments, however, the filter caninclude one or more “stent-like” support structures that may comprise,for example, a framework having one or more longitudinal struts or hoopsthat form a an outer surrounding and/or inner supporting latticestructure that assists in the expansion and wall apposition of thedevice. The hoops and struts may be made of a resilient metal and/orpolymer material to make a self-expanding framework or a malleable orplastically deformable material to make a framework that can be expandedwith an inflatable balloon or other expansion mechanism. Alternatively,the framework can be made of a shape-memory material that can be used todeploy and/or retract the embolic protection device.

The length of embolic protection device of the present invention shouldbe sufficient to cover the aortic side vessels and to extendsufficiently into the ascending and descending regions of the aorta onboth sides of the side vessels to assure that no emboli can bypass thefilter. Beyond that requirement, the length of the device is notcritical and may be constructed with the filter mesh structure andoptionally the “stent-like” support structure made either longer orshorter without adversely affecting the performance of the product. Inother alternate construction, the “stent” support structure need not becylindrical can for example be made slightly conical with the wider endof the cone oriented toward the upstream direction.

The embolic protection device of the present invention may be retractedand withdrawn together with or after the catheters used to perform adiagnostic or interventional procedure at the end of the procedure.Optionally, the embolic protection device may include features to assistin retracting the device for retrieval from the vessel. In oneembodiment, a conical guiding structure may be slidably attached to thecatheter at the proximal end of the device, the purpose of which is toassist the embolic protection device in collapsing when a retrievalsheath is advanced along the conical guiding structure. In anotherembodiment, portions of the embolic protection device may be constructedwith retraction members or retrieval wires that are configured likepurse strings or lassos around the circumference of the device. A pullloop or other graspable structure near the downstream end of the embolicprotection device may be connected to the retraction members by one ormore connecting members.

In still further embodiments, the filter may contain one or more supportstructures or wires that provide longitudinal stiffness to the device toprevent compression or movement of the filter during the procedure. Suchwires or structures may extend the full length of the device or only fora portion of its length and such wires or structures shall be eitherfixedly or slidably attached to the access sheath.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an exemplary embodiment of an embolic protectiondevice constructed in accordance with the principles of the presentinvention and including an embolic filter attached to an inner sheaththrough the wall of a conical inner portion. The filter element is shownin an axial configuration (full line) and a curved configuration (brokenline).

FIGS. 2A through 2G illustrate alternative constructions for theattachment of the inner lumen to the embolic filter of the embolicprotection device of FIG. 1.

FIG. 3 illustrates use of a stylet for axially elongating the embolicfilter of the embolic protection device of FIG. 1 to reduce the filterdiameter to a radially collapsed diameter for delivery.

FIG. 4 illustrates use of an outer sheath for a radially constrainingthe embolic filter of the embolic protection device of FIG. 1 fordelivery.

FIGS. 5A through 5E show an exemplary embolic filter deployment protocolusing the embolic protection device and stylet of FIGS. 1 and 3.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIG. 1, an embolic protection device 10 constructed inaccordance with the principles of the present invention comprises anembolic filter component 11 including a cylindrical outer wall 12, aninterior space or volume 14, a collection chamber 16, and a closeddownstream end 20. An open upstream end 18 lies at the opposite end ofthe embolic filter component 11, where the terms downstream and upstreamrefer to the direction when the embolic filter 11 is placed in apatient's aorta. The open upstream 18 will be facing toward the heartand thus will be facing into blood flow from the heart. The downstreamend 16 will be more remote from the heart and typically be disposed inthe descending aorta, as will be described in more detail below withrespect to FIG. 5A.

The cylindrical wall 12 will typically be a single layer or multiplelayer porous mesh, usually formed from elastic wires, filaments, tapes,and most usually being formed from super elastic wires woven into aporous structure having a pore size typically in the range from 0.1 mmto 1 mm, usually from 0.1 mm to 0.2 mm.

In preferred constructions of the embolic filter 11 and cylindricalouter wall 12, the porous mesh will be elastic and pre-formed in aradially expanded configuration (so that it can be delivered in aradially constrained configuration and released from constraint toself-expand at the location of implantation in the target blood vessel)which is somewhat larger than a target blood vessel, typically largerthan a target aorta, thus usually having a diameter in the range from 15mm to 60 mm when unconstrained, more usually having a diameter in therange from 25 mm to 45 mm when unconstrained.

The embolic filter component 11 will also have a radially collapseddelivery configuration with a reduced diameter or profile kind oftypically in the range from 2 mm to 6 mm, preferably in the range from 2mm to 4 mm. The porous mesh construction is particularly suitable foraxially elongating and radially collapsing the embolic filter component,and thus a preferred construction will be a woven mesh which isotherwise minimally supported or unsupported by any other structure. Inother embodiments, however, it would be possible to provide eitheradditional or internal support structures, such as stents, scaffolds,struts, grafts, coatings, circumscribing rings, or the like, dependingon the desired specific mechanical characteristics. For the most part,however, such additional structural support will be unnecessary as thewoven porous mesh structure when radially expanded will have sufficienthoop strength and column strength to both deploy and be maintainedwithin the aorta arch, as described in more detail below.

The embolic filter component 11 of the embolic protection device 10 willalso include at least a first port and a second port to allow catheteraccess from the outside of the embolic filter component to the inside ofthe embolic filter component. Often, the first port and the second portwill be located on or near the closed distal end 20 of the embolicfilter component. In other instances, either the first port, the secondport or both the first and second ports, will be formed through the sidewall 12 of the embolic filter component 10. Various specificimplementations are illustrated in FIGS. 2A-2F discussed here and after.

In FIG. 1, the first port 22 is formed in a first conical inner portion28 located at the closed downstream end 20 of the embolic filteredcomponent 11. The first conical inner portion 28 advantageously definesthe collection chamber 16 immediately above the closed downstream end 20of the embolic filter component 11 and elevates the port 22 above thebottom of the collection chamber. In this way, emboli will collect inthe collection chamber 16 at the base of the conical inner portion 28,leaving the port itself free from collected emboli and reducing thechance that such emboli will pass through the port as catheters areintroduced and removed there through.

In FIG. 1, the second port 24 is conveniently formed in a side wall ofthe first conical inner portion 28, and the inner sheath 26 is disposedwithin and secured to the second port. Thus, in this embodiment,catheter access through the second port 24 is achieved by passing thecatheter through a lumen of the inner sheath 26. Both the first port 22and then the inner sheath 26 open into the interior 14 of the embolicfilter component 11, with the point of entry being raised above thebottom of the collection chamber 16 to reduce the risk of emboliaccidently passing through either port. The first port 22 will beexpandable so that, in the absence of a catheter passing there through,the port will be closed and emboli passing into the emboli filtercomponent 11 will not be able to pass through the port. Interventionalor other catheters (not pictured in FIG. 1) may, however, be passedthrough the first port 22 by entering through the wide opening 30 at thebase of the first conical inner portion 28 and then passing through theport 22 as the catheter advances into the tapered region of the conicalinner portion. A second catheter may be passed through the lumen of theinner sheath 26 in a generally conventional manner. While the lumen ofthe inner sheath 26 is open and thus may allow entry of embolicmaterial, inner sheath 26 provides a closed path to its external entryport, typically through an introducer sheath into the parent patient'sfemeral artery, so any emboli which enter the sheath will not bereleased into the patient's arterial circulation.

As shown in FIG. 1, the cylindrical side wall 12 of the embolic filtercomponent 11 will typically be straight in its unconstrained or “shelf”condition. When placed in the aortic arch or other constraint, however,the cylindrical wall 12 may be curved, e.g. as shown in broken line inFIG. 1. Thus, after deployment in the aortic arch, the outer surface ofthe cylindrical wall can expand into and conform to an inner wall of theaortic arch in order to provide the desired filtering of the aortic sidevessels.

Referring now to FIGS. 2A-2G, the downstream half of the embolic filtercomponent 11 may have a wide variety of configurations to provide therequired first and second ports. As shown in FIG. 2A, the inner sheath26 may be passed through the closed downstream end 20 of the embolicfilter component 11 at a location spaced laterally or radially from thebase of the first conical inner portion 28. Instead of being attached tothe side of the first conical inner portion 28, as with the embodimentof FIG. 1, a distal region of the inner sheath 26 may be attached to aninner surface of the side wall 12.

Referring now to FIG. 2B, the second port 24 may be formed in an apicalregion of a second conical inner portion 32. Unlike the first conicalinner portion 28, however, the access sheath 26 will usually be fixedlyor permanently attached to the port 24. As shown in FIG. 2B, the opendistal end of the access sheath 26 extends well beyond the port 24. Inother embodiments, however, the height or length of the second conicalinner portion 32 could be attached directly to the second port 24.

Referring now to FIG. 2C, in a fourth specific embodiment, the innersheath 26 may be passed through the closed downstream end 20 at locationimmediately adjacent to the base of the first conical inner portion 28.A distal region of the inner sheath 26 may then be attached to an outerwall portion of the first conical inner portion, as illustrated.

In a still further embodiment, as illustrated in FIG. 2D, a distal ofthe inner sheath 26 may be attached directly to a second port 24 formedin the closed downstream end 20 of the embolic filter component 11.

In another embodiment, as illustrated in FIG. 2E, the inner sheath 26 isattached as shown in FIG. 2D and the first port 22 is also formeddirectly in the closed downstream end 20 of the embolic filter component11. The port 22 may extend minimally or not at all over a base of theclosed downstream end 20.

In a still further embodiment of the inner sheath attachment detail, asshown in FIG. 2F, the inner sheath 26 may enter through a port 24 formedin the side wall 12 of the embolic filter component 11. Other aspects ofthe embolic filter component 11 remain the same as described in, forexample, FIG. 2A above.

As a final exemplary embodiment of the inner sheath attachment detail asillustrated in FIG. 2G, the inner sheath 26 may enter the widedownstream end 30 of the inner conical portion 28. A port 24 is locatedin the region between the closed downstream end 20 and the apical end ofthe conical inner portion. A distal region of the inner sheath 26 maythen be attached to an outer wall portion of the first conical innerportion 28. Having the distal region of the inner sheath 26 pass throughthe inner wall of the conical inner portion provides a particularlysecure connection between the sheath and the filter.

Referring now to FIG. 3, the embolic filter component 11 may beconfigured to have a reduced diameter for delivery by inserting a stylet40 into the interior 16 of the embolic filter component 11 so that adistal tip 41 of the stylet engages the downstream end of the embolicfilter and axially elongates the filter in order to radially collapsethe diameter, typically to a diameter in the ranges as set forth above.As shown in FIG. 3, the cylindrical wall 12 of the embolic filtercomponent 11 is shifted from an unconstrained diameter, shown in brokenline, to the radially collapsed diameter, as shown in full line. In afurther embodiment, to enable a more secure connection, the stylet mayengage the filter at multiple locations along its length in addition toat the distal tip 41.

An alternative structure for radially collapsing the embolic filtercomponent 11 is shown in FIG. 4 where an outer delivery sheath 50 isplaced over the exterior of the cylindrical outer wall 12 of the embolicfilter component 11 in order to axially elongate and radially reduce thefilter, as shown in full line. By retracting the outer delivery sheath50 from over the embolic filter component 11, the filter component willreassume the radially expanded configuration, as shown in broken line.

Referring now to FIG. 5A through 5E, delivering of an embolic filtercomponent 11 in accordance with the principles of the present inventionwill be described. The aortic anatomy as illustrated in FIG. 5A where anaortic arch AA receives blood flow from an aortic valve AV in thedirection of the arrow so that the blood flows down the descending aortaDA. The brachiocephalic artery BA, the left carotid artery CA, and theleft subclavian artery, referred to herein collectively as the “aorticside vessels,” all branch from the aortic arch and a primary purpose ofthe present invention is to prevent emboli released from the aorticvalve from entering these aortic side vessels during the performance ofany aortic valve intervention.

As shown in FIG. 5B, the embolic protection device 10 of FIG. 1 may beadvanced using a stylet 40, as illustrated in FIG. 3. Once in place withthe cylindrical outer wall 12 disposed over the aortic arch, the stylet40 may be removed allowing the cylindrical outer wall 12 to radiallyexpand to cover at least the entries into the aortic side vessels, asshown in FIG. 5C. Once the filter is deployed, the open upstream end 18of the embolic filter component 11 is disposed over the aortic valve AVto provide catheter access for one more interventional catheters. Itwill be appreciated that this open upstream end 18, while allowingrelatively unfettered access for the intervention, will also receiveemboli released by the intervention into the interior 14 of the embolicfilter component 11. The presence of the porous mesh or other filterstructure of the embolic filter component 11 over the entries to theaortic side vessels will divert and prevent emboli from entering thesevessels.

As shown in FIG. 5D, a first catheter, such as a contrast deliverycatheter 60, may be introduced through a lumen of the inner sheath 26 sothat it enters into the interior 14 of the embolic filter component 11,typically at a location close to the side branch vessels.

As shown in FIG. 5E, a second catheter 70, typically an interventionalcatheter such as a valve delivery catheter, an annuloplasty catheter, orthe like, may then be introduced through the second port 22 by passing adistal end of the catheter through the wide opening 30 at the base ofthe first conical inner portion 28 so that the catheter 70 passesthrough and opens the first port 22. The first port 22 will preferablyexpand and conform over the exterior of the second catheter 70 so thatthe risk of emboli passing through the second port is minimized oreliminated. Upon removal of the second catheter 70, the access port 22will close to prevent emboli from passing through it.

The methods and apparatus of the present invention are not limited toany particular interventional or diagnostic catheters or the performanceof any particular interventional or diagnostic procedures. Instead, theaccess ports 22 and 24 can provide for introduction of a wide variety ofcatheters and tools for performing a number of desired interventions onthe aortic valve or anywhere in ascending aorta therein. Furtheralternative embodiments may include more than two access ports, at leastone of which will be expandable as with port 22 and at least one ofwhich will be fixedly attached to an access sheath as with port 24.Additional expandable ports may also include additional inner conicalportions.

What is claimed is:
 1. An embolic protection device, said devicecomprising: a cylindrical porous mesh filter having an open distal end,a closed proximal end, an interior including a collection chamber, aradially collapsed delivery configuration, and a radially expandedconfiguration; and a sheath having a distal end, a proximal end, and aninner lumen extending from the proximal end to the distal end, saiddistal end of the sheath being fixedly attached to a proximal end of thecylindrical porous mesh filter and said inner lumen being configured toallow passage of a catheter therethrough; wherein the closed proximalend of the cylindrical porous mesh filter is fixedly attached to thedistal end of the sheath and has a radially expandable port configuredto receive catheters of different diameters therethrough; and wherein afirst catheter may be introduced into the interior of the cylindricalporous mesh filter through the inner lumen of the sheath and a secondcatheter may be introduced into the interior of the cylindrical porousmesh filter though the expandable port.
 2. An embolic protection deviceas in claim 1, wherein the radially expandable port is disposed anapical end of a conical inner portion of the closed proximal end of thecylindrical porous mesh filter.
 3. An embolic protection device as inclaim 1, wherein the distal end of the sheath is fixedly attached to aport on the proximal end of the cylindrical porous mesh filter.
 4. Anembolic protection device as in claim 2, wherein the conical innerportion defines the collection chamber between an inner surface of acylindrical outer wall and an outer surface of the conical innerportion, wherein the apical end of the conical inner portion is orientedtoward the open upstream end of the embolic filter.
 5. An embolicprotection device 4, wherein the conical inner portion is positionedinside the cylindrical outer wall and has a wider proximal end joined toa proximal of the cylindrical outer cylindrical outer wall to form theclosed proximal end.
 6. An embolic protection device as in claim 4,wherein the open distal end of the cylindrical porous mesh filter isconfigured to allow blood to flow between the conical inner portion andthe cylindrical outer portion, with a space between the conical innerportion and the cylindrical outer portion defining the collectionchamber for captured emboli.
 7. An embolic protection device as in claim1, wherein the cylindrical porous mesh filter self-expands into theexpanded configuration when the filter is in the deployed configuration.8. An embolic protection device as in claim 7, wherein the cylindricalporous mesh filter comprises a fabric of knitted, woven, or nonwovenfibers, filaments, or wires having a pore size chosen to prevent emboliover a predetermined size from passing through.
 9. An embolic protectiondevice as in claim 7, wherein the cylindrical porous mesh filter is madeof a resilient metal, polymer material, a malleable material, aplastically deformable material, a shape-memory material, orcombinations thereof.
 10. An embolic protection device as in claim 1,wherein the cylindrical porous mesh filter has an anti-thrombogeniccoating on its surface.
 11. An embolic protection device as in claim 1,wherein the cylindrical porous mesh filter has a pore size in the rangeof about 1 mm to about 0.1 mm.
 12. An embolic protection device as inclaim 1, further comprising a resilient seal positioned within theexpandable port for forming a seal around a catheter passing through theexpandable port.
 13. An embolic protection system comprising: an embolicprotection device as in claim 1; and a delivery sheath having a lumenthere through configured to restrain the embolic filter in its radiallycollapsed delivery configuration when the embolic filter is therewithin, wherein the embolic filter deploys into its radially expandedconfiguration when the embolic filter is advanced out of the outerdelivery sheath.
 14. An embolic protection system comprising: an embolicprotection device as in claim 1; and a stylet configured to be advancedthrough the sheath lumen and the embolic filter to elongate the embolicfilter to assume its radially collapsed delivery configuration, whereinthe embolic filter deploys into its radially expanded configuration whenthe stylet is removed from the embolic filter.
 15. A method foradvancing a catheter over a patient's aortic arch having aortic sidevessels, said method comprising: providing an embolic protection deviceas in claim 1; advancing the sheath through the patient's aorta toposition the cylindrical porous mesh filter over the aortic arch;radially expanding the cylindrical porous mesh filter within the aorticarch to cover the aortic side vessels with the open distal end facingthe patient's heart to direct blood flow through the upstream end andemboli into the collection chamber, wherein blood free from emboli flowsthrough the porous mesh into the aortic side vessels; advancing thefirst catheter through the inner lumen of the sheath, through theinterior of the cylindrical porous mesh filter, and toward the heart;and advancing the second catheter through the though the expandableport, through the interior of the cylindrical porous mesh filter, andtoward the heart.
 16. A method as in claim 15, further comprisingperforming a first diagnostic or interventional procedure with the firstcatheter and performing a second diagnostic or interventional procedurewith the second catheter.
 17. A method as in claim 15, wherein thesheath is used to advance the cylindrical porous mesh filter through adelivery sheath that constrains the embolic protection device in itsradially collapsed configuration while it is being delivered.
 18. Amethod as in claim 17, wherein radially expanding the cylindrical porousmesh filter comprises proximally retracting the delivery sheath relativeto the embolic protection device to release the embolic protectiondevice from radial constraint.
 19. A method as in claim 15, furthercomprising performing an interventional procedure with the firstcatheter positioned through the first port and introducing contrastmedia through a second catheter positioned through the inner sheath andsecond port while the interventional procedure is being performed.
 20. Amethod as in claim 19, wherein the interventional procedure is deliveryof a prosthetic aortic valve.